Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (5): 889-897.DOI: 10.1016/S1872-2067(19)63499-6

• Articles • Previous Articles    

Controllable photochemical synthesis of amorphous Ni(OH)2 as hydrogen production cocatalyst using inorganic phosphorous acid as sacrificial agent

Dandan Lia, Yuming Donga, Guangli Wanga, Pingping Jianga, Feiyan Zhanga, Huizhen Zhanga, Ji Lib, Jinze Lyub, Yan Wangb, Qingyun Liuc   

  1. a International Joint Research Center for Photo-responsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China;
    b Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China;
    c College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
  • Received:2019-08-20 Revised:2019-09-04 Online:2020-05-18 Published:2019-12-31
  • Contact: S1872-2067(19)63499-6
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21676123, 21575052), the Natural Science Foundation of Jiangsu Province (BK20161127), the Fundamental Research Funds for the Central Universities (JUSRP51623A), the National First-class Discipline Program of Food Science and Technology (JUFSTR20180301), the Opening Foundation of Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals (ZDSYS-KF201504) from Shandong Normal University, the MOE & SAFEA for the 111 Project (B13025), and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX19_1874).

Abstract: Loading of cocatalysts can effectively inhibit the recombination of photogenerated carriers in photocatalysts and greatly improve the photocatalytic hydrogen production rate. Cocatalysts can be deposited at the outlet points of electrons using a photochemical method, which is beneficial for the following photocatalytic hydrogen production reaction. H2PO2- has been used in the photochemical reduction of transition metals because of its special properties. However, the particles formed in the presence of H2PO2- are very large and highly crystalline, which may inhibit the activity of photocatalysts. In this study, we designed a new method for synthesizing photocatalysts by photodeposition using some other phosphates, aiming to prepare controllable weakly crystalline and small-size cocatalysts to improve the hydrogen production activity. The cocatalyst prepared using H2PO3- as an inorganic sacrificial agent has an amorphous structure and an average size of about 10 nm. The optimal photocatalytic hydrogen production rate of the obtained Ni(OH)2/g-C3N4 (4.36 wt%) is 13707.86 μmol·g-1·h-1, which is even higher than the activity of Pt-4.36 wt%/g-C3N4 (11210.93 μmol·g-1·h-1). Mechanistic studies show that loading of Ni(OH)2 can efficiently accelerate the separation and transfer efficiency of photogenerated charge carriers.

Key words: Photocatalysis, Photodeposition, Hydrogen production, Water splitting, Ni(OH)2/g-C3N4